Hi Guys,
Not posted a reply here but as I have an intrest in the Bren I thought I would throw some info your way. All the British made L4A1/2/4 guns were based on the British Mk3 gun only. Only Enfield and the Indians (Who still made a version till recently) made the Mk3 gun.
The L4A3/5 guns were converted from any of the Mk2s available, Daimler/monotype or Inglis.
It is true that Enfield used surplus 7.92mm Breech blocks for the first L4A1s but they soon began to make there own.
The L4 flash hider is a heavier and stronger version of the L1A1 SLR type.
The Indians converted some of their Mk3s to L4 spec in the same way as Enfield did with the circular body inserts, but there guns are not marked L4Ax, they are marked IMG XXA. They then began to make a NEW L4A4 type gun which because it was new, didn't need the circular body inserts.
Also, the SA 7.62mm guns can be found converted from any Bren, I've seen Mk1s from the Enfield and Inglis (Strangely non from Lithgow yet) factories, Mk2s from Daimler and Inglis and Mk3s from Enfield. These are roughly following the development of the L4A1 type guns without body inserts.
Does anyone have a Indian Bren gun, these are quite intresting guns to study.
ATB Chris.